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/*
 * Copyright (C) 2004 - 2014 Brian McCallister
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.skife.jdbi.v2.sqlobject;

import java.lang.annotation.Annotation;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

import org.skife.jdbi.v2.SQLStatement;

class BindMapFactory implements BinderFactory
{
    @Override
    public Binder build(Annotation annotation)
    {
        return new Binder()
        {
            @SuppressWarnings("unchecked")
            @Override
            public void bind(SQLStatement q, BindMap bind, Object arg)
            {
                final String prefix;
                if (BindBean.BARE_BINDING.equals(bind.prefix())) {
                    prefix = "";
                }
                else {
                    prefix = bind.prefix() + ".";
                }

                final Set allowedKeys = new HashSet(Arrays.asList(bind.value()));
                final Map map = (Map) arg;

                for (Entry e : map.entrySet()) {
                    final Object keyObj = e.getKey();
                    final String key;
                    if (bind.implicitKeyStringConversion() || (keyObj instanceof String)) {
                        key = keyObj.toString();
                    } else {
                        throw new IllegalArgumentException("Key " + keyObj + " (of " + keyObj.getClass() + ") must be a String");
                    }

                    if (allowedKeys.isEmpty() || allowedKeys.remove(key)) {
                        q.bind(prefix + key, e.getValue());
                    }
                }

                // Any leftover keys were specified but not found in the map, so bind as null
                for (String key : allowedKeys) {
                    final Object val = map.get(key);
                    if (val != null) {
                        throw new IllegalStateException("Internal error: map iteration missed key " + key);
                    }
                    q.bind(prefix + key, (Object) null);
                }
            }
        };
    }
}